scispace - formally typeset
Search or ask a question
Topic

Apochromat

About: Apochromat is a research topic. Over the lifetime, 642 publications have been published within this topic receiving 7934 citations.


Papers
More filters
Journal ArticleDOI
TL;DR: In this paper, measurements of the absolute sensitivity of three different optical cameras were presented, and an absolutely calibrated tungsten strip-lamp was used for calibrating the devices, and the results with five bandpass filters between 337nm and 740nm were shown.
Abstract: Measurements of the absolute sensitivity of three different optical cameras are presented. An absolutely calibrated tungsten strip-lamp was used for calibrating the devices. An experimental method for determining the solid angle which is accepted by the combination of the cameras with a broadband apochromatic lens is described. The results with five bandpass filters between 337nm and 740nm are shown. The signal to noise ratio and the spatial resolution of the camera systems is also discussed.

3 citations

Proceedings ArticleDOI
26 Jul 1985
TL;DR: The modern zoom lens for 35 millimeter photography has a focal length range extending from the wide angle to telephoto, potentially replacing several single focal length lenses or zoom lenses of small range as the standard photographic objective as mentioned in this paper.
Abstract: The modern zoom lens for 35 millimeter photography has a focal length range extending from the wide angle to telephoto, potentially replacing several single focal length lenses or zoom lenses of small range as the standard photographic objective. This recent development appears to be the result of a continuous design evolution; each new design widening the range of power change utilized by the particular configuration. When a particular configuration is extended too far, the lens design necessary for aberration correction becomes complex, and a new configuration is developed.

3 citations

Proceedings ArticleDOI
TL;DR: In this article, a tunable lens, formed by spherical profiled elastic membranes and a liquid medium between them, has been developed to change the focal length of the lens by using an optomechanical system.
Abstract: Tunable lenses have become very popular elements due their capacity of change their focal length by only modifying their shape. This characteristic is very useful in different applications in the field of optics. The development of tunable lenses consists on several phases: first, to find a suitable material, second, to obtain an optimal analysis and design, and third, to find the way to change the lens shape and characterization. In this work we present the characterization of a tunable lens, formed by spherical profiled elastic membranes and a liquid medium between them. The proposed liquidfilled tunable has a design such that the spherical aberration is the least to different focus. The development of an optomechanical system to change the lens shape is presented.

3 citations

Patent
Kee-uk Jeon1, Yong-Dok Cha1
02 Jul 2003
TL;DR: In this paper, a projection lens system for an image projection apparatus that enhances the image aberration correction rate to achieve high resolution and luminance is presented, which includes a first lens group having first and second spherical lenses of positive refraction power movable along an optical axis.
Abstract: A projection lens system for an image projection apparatus that enhances the image aberration correction rate to achieve high resolution and luminance. The lens system includes a first lens group having first and second spherical lenses of positive refraction power movable along an optical axis, a second lens group having a third doublet lens formed with a lens of positive refraction power and a lens of negative refraction power in junction to correct chromatic aberration, and a fourth spherical lens to correct spherical aberration, a third lens group having lenses of positive refraction power, and a fourth lens group for correcting distortions having a seventh spherical lens being concave on both surfaces thereof, an eighth spherical lens of negative refraction power having a concave surface on one side and a convex surface on the other side, and a ninth lens of negative refraction power having an aspheric surface.

3 citations

Book ChapterDOI
R.H.H. Kröger1
01 Jan 2011
TL;DR: The optical system of a typical fish eye, as present in many shallow-water species, is adapted to hydrodynamic constraints and wide-angle color vision, and various fish eyes have fascinating optical adaptations to special visual demands.
Abstract: The optical system of a typical fish eye, as present in many shallow-water species, is adapted to hydrodynamic constraints and wide-angle color vision. The cornea has little refractive power in water, such that the crystalline lens is the dominating refractive element. Fish lenses are gradient-index lenses that often have multiple focal lengths in monochromatic light (multifocal lenses). In light containing a spectrum of wavelengths, a different range of wavelengths is focused on the retina by each focal length, such that well-focused color images are created. Adjustment of focus (accommodation) occurs by movements of the lens in teleosts and chondrichthyes, while it is unclear whether lungfishes and lampreys are capable of accommodation. Various fish eyes have fascinating optical adaptations to special visual demands.

3 citations


Network Information
Related Topics (5)
Lens (optics)
156.4K papers, 1.2M citations
79% related
Grating
54.6K papers, 651K citations
71% related
Refractive index
51.5K papers, 774K citations
70% related
Femtosecond
35.1K papers, 691.4K citations
69% related
Interferometry
58K papers, 824.8K citations
67% related
Performance
Metrics
No. of papers in the topic in previous years
YearPapers
20214
20204
20196
20188
201716
201625